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AJvYcCURzghs1A091MNW00w8Inv2cO0FTIRw5XQSh4yLFgwjMk4b9RymIkRpj6ZmZsabh3gy+qfvaR/PT9mKQ8Q=@vger.kernel.org X-Gm-Message-State: AOJu0YzSDvzY1PAARM5y9kUA854MoANI2hFwiywrXhObszVrtl4mOXq9 bKSZKpLVPaTIcqe2U33vywH/FmNhFIbmg0j39SY9Ll1rTwovI7HDMed29+dz3xKJc22qvub4w4u dxmEon+8xuvIHlY6CbjqfpNa+78xRkP/0kIf/84OsO3INugW3XvPiZQvl9Pg= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1c9e:b0:679:e595:ff30 with SMTP id 006d021491bc7-67b17750586mr3093380eaf.36.1772692765699; Wed, 04 Mar 2026 22:39:25 -0800 (PST) Date: Wed, 04 Mar 2026 22:39:25 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69a9251d.a70a0220.2f119.0003.GAE@google.com> Subject: [syzbot] [exfat?] [gfs2?] WARNING in filename_symlinkat From: syzbot To: brauner@kernel.org, gfs2@lists.linux.dev, jack@suse.cz, linkinjeon@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, sj1557.seo@samsung.com, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ecc64d2dc9ff Merge tag 'sysctl-7.00-fixes-rc3' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1754b5aa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c5c49ee0942d1cdb dashboard link: https://syzkaller.appspot.com/bug?extid=2ed46b6b748df855347f compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=123dbe4a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c99b5a580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ecc64d2d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/86a2ecaacd1b/vmlinux-ecc64d2d.xz kernel image: https://storage.googleapis.com/syzbot-assets/b1dad86775e5/bzImage-ecc64d2d.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/1d38e5a93707/mount_4.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=17c57006580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2ed46b6b748df855347f@syzkaller.appspotmail.com ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff8880460da1f8, owner = 0x0, curr 0xffff8880371624c0, list empty WARNING: kernel/locking/rwsem.c:1381 at __up_write kernel/locking/rwsem.c:1380 [inline], CPU#0: syz.0.31/5575 WARNING: kernel/locking/rwsem.c:1381 at up_write+0x2d6/0x410 kernel/locking/rwsem.c:1643, CPU#0: syz.0.31/5575 Modules linked in: CPU: 0 UID: 0 PID: 5575 Comm: syz.0.31 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__up_write kernel/locking/rwsem.c:1380 [inline] RIP: 0010:up_write+0x388/0x410 kernel/locking/rwsem.c:1643 Code: cc 8b 49 c7 c2 80 eb cc 8b 4c 0f 44 d0 48 8b 7c 24 08 48 c7 c6 e0 ed cc 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 10 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 5a 83 0b 03 e9 67 fd ff ff 48 c7 c1 RSP: 0018:ffffc9000298fd80 EFLAGS: 00010246 RAX: ffffffff8bcceb60 RBX: ffff8880460da1f8 RCX: ffff8880460da1f8 RDX: 0000000000000000 RSI: ffffffff8bccede0 RDI: ffffffff901501f0 RBP: ffff8880460da250 R08: 0000000000000000 R09: ffff8880371624c0 R10: ffffffff8bcceb60 R11: ffffed1008c1b441 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880460da1f8 R15: 1ffff11008c1b440 FS: 00007fbd46c406c0(0000) GS:ffff88808ca58000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd45de9e80 CR3: 00000000412ea000 CR4: 0000000000352ef0 Call Trace: inode_unlock include/linux/fs.h:1038 [inline] end_dirop fs/namei.c:2947 [inline] end_creating include/linux/namei.h:126 [inline] end_creating_path fs/namei.c:4962 [inline] filename_symlinkat+0x222/0x410 fs/namei.c:5642 __do_sys_symlinkat fs/namei.c:5660 [inline] __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbd45d9c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbd46c40028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007fbd46016090 RCX: 00007fbd45d9c799 RDX: 00002000000003c0 RSI: 0000000000000007 RDI: 0000200000000240 RBP: 00007fbd45e32bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbd46016128 R14: 00007fbd46016090 R15: 00007ffcbe33eb58 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 49 c7 c2 80 eb cc 8b mov $0xffffffff8bcceb80,%r10 7: 4c 0f 44 d0 cmove %rax,%r10 b: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 10: 48 c7 c6 e0 ed cc 8b mov $0xffffffff8bccede0,%rsi 17: 48 8b 14 24 mov (%rsp),%rdx 1b: 4c 89 f1 mov %r14,%rcx 1e: 4d 89 e0 mov %r12,%r8 21: 4c 8b 4c 24 10 mov 0x10(%rsp),%r9 26: 41 52 push %r10 * 28: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2d: 48 83 c4 08 add $0x8,%rsp 31: e8 5a 83 0b 03 call 0x30b8390 36: e9 67 fd ff ff jmp 0xfffffda2 3b: 48 rex.W 3c: c7 .byte 0xc7 3d: c1 .byte 0xc1 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup